a{
	text-decoration: none;
}
div{
	text-align: center;
	margin-top: 60px;
}
table{
	margin: 50px auto;
	border: 2px solid gray;
	width: 500px;
}
td,th{
	text-align: center;
	border: 2px solid gray;
}
.select{
	margin: auto;
}
.tr_over{
	background-color: #BCE8F1;
}
.tr_out{
	background-color: none;
}